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UID:7721@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20161024T140000
DTEND;TZID=Europe/Paris:20161024T150000
DTSTAMP:20241120T204811Z
URL:https://www.i2m.univ-amu.fr/evenements/signature-defects-handles-and-r
 ibbon-discs/
SUMMARY:Marco Golla (Uppsala University): Signature defects\, handles\, and
  ribbon discs
DESCRIPTION:Marco Golla: The homology groups of a manifold give a lower bou
 nd on the number of handles in a handle decomposition (or even on the cell
 s of a CW decomposition). We use Casson-Gordon signatures to improve on th
 is bound for rational homology 4-balls bounding a given rational homology 
 3-sphere. In turn\, this gives information about slice and ribbon discs fo
 r knots in the 3-sphere.\n\nThis is joint work (in progress) with Paolo Ac
 eto and Ana Lecuona.\n\n\n
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 020/01/Marco_Golla.jpg
CATEGORIES:Séminaire,Dynamique et Topologie
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DTSTART:20160327T030000
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